This is a trial problem where you have to guess and check.
An easy way is to split 321 the closest to a half which can be 161 or 160
If we add 5 to one one (166) is it 5 more than the other? (321 - 166 = 155) So, no.
Let's make the number 163. Is it 5 more than the other? (321 - 163 = 158)
They are 5 away from each other which means we can use 163 for the amount of girls
There are 163 girls
Answer:
The correct answer is D. 3 % p. a .
Step-by-step explanation:
For the investment offered, Martin is supposed to get $180 as an interest ($6,180 - $6,000).
Now Martin is borrowing $6,000 from the bank to make this investment. He should be charged $180, so that he breaks even on investment.
Thus using the formula:
Interest= Principal × Time ( per annum) × ; (Here simple and compound interest are same as the sum borrowed is to be charged for a single year)
⇒ 180 = × 1 × Interest rate
⇒ 180 = 60 × Interest rate
⇒ Interest rate = 3
Thus the correct answer is 3% per annum.